Results 11 to 20 of about 86,758,594 (170)

A Hybrid Genetic Algorithm for Satellite Image Downlink Scheduling Problem

open access: yesDiscrete Dynamics in Nature and Society, 2018
The satellite image downlink scheduling problem (SIDSP) is included in satellite mission planning as an important part. A customer demand is finished only if the corresponding images are eventually downloaded.
Bingyu Song   +4 more
doaj   +2 more sources

Effects of atmospheric turbulence on fiber-coupled DPSK system in Satellite-to-Ground downlink

open access: yesResults in Physics, 2018
Fiber-coupled differential phase-shift keying (DPSK) modulation is potentially an effective approach for further high-speed satellite lasercom, due to the high detection sensitivity, low linewidth requirements, and uncalled-for complex phase-locked loop ...
Qingbo Yang   +6 more
doaj   +2 more sources

GRIP-MAPPO: Feasibility-Preserving Graph-Relational Insertion-Preference Learning for Downlink-Constrained LEO Remote-Sensing Scheduling

open access: yesRemote Sensing
Online scheduling for low-Earth-orbit (LEO) remote-sensing constellations must coordinate short observation windows, sequence-dependent slews, finite onboard resources, intermittent downlink contacts, and rolling command commitment.
Fangrong Zhou   +8 more
doaj   +2 more sources

Coordinated studies of the geospace environment using cluster, satellite and ground-based data: An interim review [PDF]

open access: yes, 2005
A little more than four years after its launch, the first magnetospheric, multi-satellite mission Cluster has already tremendously contributed to our understanding about the coupled solar wind - magnetosphere - ionosphere system.
Kauristie, K.   +12 more
core   +6 more sources

A Pilot-Assisted Equalisation scheme for the UMTS-TDD Downlink with Partial Loading [PDF]

open access: yes, 2005
In this paper, we address a pilot-assisted channel equalisation strategy for the partially loaded downlink time-division duplex (TDD) component of the universal mobile telecommunication system (UMTS).
Weiss, Stephan   +3 more
core   +5 more sources

RaVÆn: unsupervised change detection of extreme events using ML on-board satellites

open access: yesScientific Reports, 2022
Applications such as disaster management enormously benefit from rapid availability of satellite observations. Traditionally, data analysis is performed on the ground after being transferred—downlinked—to a ground station.
Vít Růžička   +7 more
doaj   +1 more source

Performance of Integrated Ground-Air-Space FSO Links Over Various Turbulent Environments

open access: yesIEEE Photonics Journal, 2022
We analyze the outage probability of integrated ground-air-space free-space optical (FSO) communication links for different atmospheric turbulence channel models.
Yalcn Ata, Mohamed-Slim Alouini
doaj   +1 more source

Optical High-Capacity Satellite Downlinks via High-Altitude Platform Relays [PDF]

open access: yes, 2007
Earth-observation (EO) satellite missions produce a large amount of data using high-resolution optical or radar sensors. During the last decades the amount of data has steadily increased due to improved sensor technologies with increased temporal ...
Florian Moll   +13 more
core   +1 more source

Optical Satellite Downlinks to Optical Ground Stations and High-Altitude Platforms [PDF]

open access: yes, 2007
Earth-observation (EO) satellite missions using highresolution optical or radar sensors are producing an immense amount of data which needs to be send down to earth.
Giggenbach, Dirk   +5 more
core   +1 more source

On Orbit Demonstration of Pointing Accuracy of Ground Antennas by a Flying GEO Satellite

open access: yesSakarya University Journal of Computer and Information Sciences, 2023
Geostationary Satellites (GEO) are being used commonly in communication market. The service providers uplink or downlink the signal by using their dedicated antennas (whether with or without tracking capability) to the GEO satellite.
Ümit Güler, Ümit Cezmi Yılmaz
doaj   +1 more source

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